Configuring Extended-Range Vlans - Cisco Catalyst 3550 series Software Configuration Manual

Configuring Extended-Range VLANs

Configuring Extended-Range VLANs
When the switch is in VTP transparent mode (VTP disabled), you can create extended-range VLANs (in
the range 1006 to 4094). Extended-range VLANs enable service providers to extend their infrastructure
to a greater number of customers. The extended-range VLAN IDs are allowed for any switchport
commands that allow VLAN IDs. You always use config-vlan mode (accessed by entering the vlan
vlan-id global configuration command) to configure extended-range VLANs. The extended range is not
supported in VLAN database configuration mode (accessed by entering the vlan database privileged
EXEC command).
Extended-range VLAN configurations are not stored in the VLAN database, but because VTP mode is
transparent, they are stored in the switch running configuration file, and you can save the configuration
in the startup configuration file by using the copy running-config startup-config privileged EXEC
command.
Note Although the switch supports 4094 VLAN IDs, see the
the actual number of VLANs supported.
This section includes this information about extended-range VLANs:
•
•
•
•
Default VLAN Configuration
See
the MTU size on extended-range VLANs; all other characteristics must remain at the default state.
Extended-Range VLAN Configuration Guidelines
Follow these guidelines when creating extended-range VLANs:
•
•
•
•
•
Catalyst 3550 Multilayer Switch Software Configuration Guide
12-12
Default VLAN Configuration, page 12-12
Extended-Range VLAN Configuration Guidelines, page 12-12
Creating an Extended-Range VLAN, page 12-13
Creating an Extended-Range VLAN with an Internal VLAN ID, page 12-14
Table 12-2 on page 12-8 for the default configuration for Ethernet VLANs. You can change only
To add an extended-range VLAN, you must use the vlan vlan-id global configuration command and
access config-vlan mode. You cannot add extended-range VLANs in VLAN database configuration
mode (accessed by entering the vlan database privileged EXEC command).
VLAN IDs in the extended range are not saved in the VLAN database and are not recognized by
VTP.
You cannot include extended-range VLANs in the pruning eligible range.
The switch must be in VTP transparent mode when you create extended-range VLANs. If VTP mode
is server or client, an error message is generated, and the extended-range VLAN is rejected.
You can set the VTP mode to transparent in global configuration mode or in VLAN database
configuration mode. See the
should save this configuration to the startup configuration so that the switch will boot up in VTP
transparent mode. Otherwise, you will lose extended-range VLAN configuration if the switch resets.
"Supported VLANs" section on page 12-2
"Disabling VTP (VTP Transparent Mode)" section on page
Chapter 12 Configuring VLANs
for
13-11. You
78-11194-09